Stakeholder Pension(?)

Maybe a silly question, but some advice would be great please. When i was 18 i joined my employers stakeholder pension scheme into which I paid £50 per month, the scheme was with aviva (formerly norwich union) I have since left and been working for the NHS for 10 years and paying into the NHS pension scheme.

Is it possible to cash in the stakeholder pension? Dont think there is much in there about £1000 I think or is possible to transfer it into my NHS pension?